As an astronaut, If I could change one thing it would be people's perception of spaceflight. I think it is seen too often as a distant, flashy endeavour - cool, but not relevant, and that could not be further from the truth! The science conducted in space leads to medical and technical advancements that benefit everyone. Most people don't realize the ripple effect of space research that sparks innovation, jobs and solutions that range from cancer treatments to your smartphone's camera!